The kingdom's inhabitants look down on the young Prince Bojji, who is both deaf and mute. They mock his perceived foolishness, labeling him "The Useless Prince." Yet, although Bojji lacks physical strength, he is by no means weak of heart. A chance encounter with a shadow creature, which should have left him traumatized, instead leads him to believe he has found a friend among those who only notice his flaws. He begins meeting regularly with Kage, the shadow, to the extent that even the otherwise abrasive creature starts to warm up to him. The unlikely friendship between Kage and Bojji lays the budding foundations for the prince's journey, one in which he intends to conquer his fears and insecurities. Despite the constant ridicule he faces, Bojji resolves to fulfill his desire to become the best king he can be.